/// CloneFunction - Return a copy of the specified function, but without
/// embedding the function into another module. Also, any references specified
/// in the VMap are changed to refer to their mapped value instead of the
/// original one. If any of the arguments to the function are in the VMap,
/// the arguments are deleted from the resultant function. The VMap is
/// updated to include mappings from all of the instructions and basicblocks in
/// the function from their old to new values.
///
Function *llvm::CloneFunction(const Function *F, ValueToValueMapTy &VMap,
bool ModuleLevelChanges,
ClonedCodeInfo *CodeInfo) {
std::vector<Type*> ArgTypes;
// The user might be deleting arguments to the function by specifying them in
// the VMap. If so, we need to not add the arguments to the arg ty vector
//
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
if (VMap.count(I) == 0) // Haven't mapped the argument to anything yet?
ArgTypes.push_back(I->getType());
// Create a new function type...
FunctionType *FTy = FunctionType::get(F->getFunctionType()->getReturnType(),
ArgTypes, F->getFunctionType()->isVarArg());
// Create the new function...
Function *NewF = Function::Create(FTy, F->getLinkage(), F->getName());
// Loop over the arguments, copying the names of the mapped arguments over...
Function::arg_iterator DestI = NewF->arg_begin();
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
if (VMap.count(I) == 0) { // Is this argument preserved?
DestI->setName(I->getName()); // Copy the name over...
VMap[I] = DestI++; // Add mapping to VMap
}
SmallVector<ReturnInst*, 8> Returns; // Ignore returns cloned.
CloneFunctionInto(NewF, F, VMap, ModuleLevelChanges, Returns, "", CodeInfo);
return NewF;
}
void Andersen::collectConstraintsForGlobals(Module& M)
{
// Create a pointer and an object for each global variable
for (auto const& globalVal: M.globals())
{
NodeIndex gVal = nodeFactory.createValueNode(&globalVal);
NodeIndex gObj = nodeFactory.createObjectNode(&globalVal);
constraints.emplace_back(AndersConstraint::ADDR_OF, gVal, gObj);
}
// Functions and function pointers are also considered global
for (auto const& f: M)
{
// If f is an addr-taken function, create a pointer and an object for it
if (f.hasAddressTaken())
{
NodeIndex fVal = nodeFactory.createValueNode(&f);
NodeIndex fObj = nodeFactory.createObjectNode(&f);
constraints.emplace_back(AndersConstraint::ADDR_OF, fVal, fObj);
}
if (f.isDeclaration() || f.isIntrinsic())
continue;
// Create return node
if (f.getFunctionType()->getReturnType()->isPointerTy())
{
nodeFactory.createReturnNode(&f);
}
// Create vararg node
if (f.getFunctionType()->isVarArg())
nodeFactory.createVarargNode(&f);
// Add nodes for all formal arguments.
for (Function::const_arg_iterator itr = f.arg_begin(), ite = f.arg_end(); itr != ite; ++itr)
{
if (isa<PointerType>(itr->getType()))
nodeFactory.createValueNode(itr);
}
}
// Init globals here since an initializer may refer to a global var/func below it
for (auto const& globalVal: M.globals())
{
NodeIndex gObj = nodeFactory.getObjectNodeFor(&globalVal);
assert(gObj != AndersNodeFactory::InvalidIndex && "Cannot find global object!");
if (globalVal.hasDefinitiveInitializer())
{
addGlobalInitializerConstraints(gObj, globalVal.getInitializer());
}
else
{
// If it doesn't have an initializer (i.e. it's defined in another translation unit), it points to the universal set.
constraints.emplace_back(AndersConstraint::COPY,
gObj, nodeFactory.getUniversalObjNode());
}
}
}
/// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
/// a suffix on their name indicating the number of words of arguments they
/// take.
static void AddFastCallStdCallSuffix(SmallVectorImpl<char> &OutName,
const Function *F, const DataLayout &TD) {
// Calculate arguments size total.
unsigned ArgWords = 0;
for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
AI != AE; ++AI) {
Type *Ty = AI->getType();
// 'Dereference' type in case of byval parameter attribute
if (AI->hasByValAttr())
Ty = cast<PointerType>(Ty)->getElementType();
// Size should be aligned to DWORD boundary
ArgWords += ((TD.getTypeAllocSize(Ty) + 3)/4)*4;
}
raw_svector_ostream(OutName) << '@' << ArgWords;
}
开发者ID:royqin，项目名称:llvm，代码行数:19，代码来源:Mangler.cpp
示例10: SectionForFrame
void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
const Function *F = MF.getFunction();
const TargetData *TD = TM.getTargetData();
// Emit the data section name.
O << "\n";
PIC16Section *fPDataSection =
const_cast<PIC16Section *>(getObjFileLowering().
SectionForFrame(CurrentFnSym->getName()));
fPDataSection->setColor(getFunctionColor(F));
OutStreamer.SwitchSection(fPDataSection);
// Emit function frame label
O << PAN::getFrameLabel(CurrentFnSym->getName()) << ":\n";
const Type *RetType = F->getReturnType();
unsigned RetSize = 0;
if (RetType->getTypeID() != Type::VoidTyID)
RetSize = TD->getTypeAllocSize(RetType);
//Emit function return value space
// FIXME: Do not emit RetvalLable when retsize is zero. To do this
// we will need to avoid printing a global directive for Retval label
// in emitExternandGloblas.
if(RetSize > 0)
O << PAN::getRetvalLabel(CurrentFnSym->getName())
<< " RES " << RetSize << "\n";
else
O << PAN::getRetvalLabel(CurrentFnSym->getName()) << ": \n";
// Emit variable to hold the space for function arguments
unsigned ArgSize = 0;
for (Function::const_arg_iterator argi = F->arg_begin(),
arge = F->arg_end(); argi != arge ; ++argi) {
const Type *Ty = argi->getType();
ArgSize += TD->getTypeAllocSize(Ty);
}
O << PAN::getArgsLabel(CurrentFnSym->getName()) << " RES " << ArgSize << "\n";
// Emit temporary space
int TempSize = PTLI->GetTmpSize();
if (TempSize > 0)
O << PAN::getTempdataLabel(CurrentFnSym->getName()) << " RES "
<< TempSize << '\n';
}
/// Microsoft fastcall and stdcall functions require a suffix on their name
/// indicating the number of words of arguments they take.
static void addByteCountSuffix(raw_ostream &OS, const Function *F,
const DataLayout &DL) {
// Calculate arguments size total.
unsigned ArgWords = 0;
for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
AI != AE; ++AI) {
Type *Ty = AI->getType();
// 'Dereference' type in case of byval or inalloca parameter attribute.
if (AI->hasByValOrInAllocaAttr())
Ty = cast<PointerType>(Ty)->getElementType();
// Size should be aligned to pointer size.
unsigned PtrSize = DL.getPointerSize();
ArgWords += RoundUpToAlignment(DL.getTypeAllocSize(Ty), PtrSize);
}
OS << '@' << ArgWords;
}
开发者ID:0x00evil，项目名称:llvm，代码行数:19，代码来源:Mangler.cpp
示例12: SwitchToSection
void PIC16AsmPrinter::EmitFunctionFrame(MachineFunction &MF) {
const Function *F = MF.getFunction();
std::string FuncName = Mang->getValueName(F);
const TargetData *TD = TM.getTargetData();
// Emit the data section name.
O << "\n";
const char *SectionName = PAN::getFrameSectionName(CurrentFnName).c_str();
const Section *fPDataSection = TAI->getNamedSection(SectionName,
SectionFlags::Writeable);
SwitchToSection(fPDataSection);
// Emit function frame label
O << PAN::getFrameLabel(CurrentFnName) << ":\n";
const Type *RetType = F->getReturnType();
unsigned RetSize = 0;
if (RetType->getTypeID() != Type::VoidTyID)
RetSize = TD->getTypeAllocSize(RetType);
//Emit function return value space
// FIXME: Do not emit RetvalLable when retsize is zero. To do this
// we will need to avoid printing a global directive for Retval label
// in emitExternandGloblas.
if(RetSize > 0)
O << PAN::getRetvalLabel(CurrentFnName) << " RES " << RetSize << "\n";
else
O << PAN::getRetvalLabel(CurrentFnName) << ": \n";
// Emit variable to hold the space for function arguments
unsigned ArgSize = 0;
for (Function::const_arg_iterator argi = F->arg_begin(),
arge = F->arg_end(); argi != arge ; ++argi) {
const Type *Ty = argi->getType();
ArgSize += TD->getTypeAllocSize(Ty);
}
O << PAN::getArgsLabel(CurrentFnName) << " RES " << ArgSize << "\n";
// Emit temporary space
int TempSize = PTLI->GetTmpSize();
if (TempSize > 0 )
O << PAN::getTempdataLabel(CurrentFnName) << " RES " << TempSize <<"\n";
}
/// Identify lowered values that originated from f128 arguments and record
/// this.
void MipsCCState::PreAnalyzeFormalArgumentsForF128(
const SmallVectorImpl<ISD::InputArg> &Ins) {
const MachineFunction &MF = getMachineFunction();
for (unsigned i = 0; i < Ins.size(); ++i) {
Function::const_arg_iterator FuncArg = MF.getFunction()->arg_begin();
// SRet arguments cannot originate from f128 or {f128} returns so we just
// push false. We have to handle this specially since SRet arguments
// aren't mapped to an original argument.
if (Ins[i].Flags.isSRet()) {
OriginalArgWasF128.push_back(false);
OriginalArgWasFloat.push_back(false);
continue;
}
assert(Ins[i].getOrigArgIndex() < MF.getFunction()->arg_size());
std::advance(FuncArg, Ins[i].getOrigArgIndex());
OriginalArgWasF128.push_back(
originalTypeIsF128(FuncArg->getType(), nullptr));
OriginalArgWasFloat.push_back(FuncArg->getType()->isFloatingPointTy());
}
}
std::unique_ptr<Module> llvm::CloneModule(
const Module *M, ValueToValueMapTy &VMap,
std::function<bool(const GlobalValue *)> ShouldCloneDefinition) {
// First off, we need to create the new module.
std::unique_ptr<Module> New =
llvm::make_unique<Module>(M->getModuleIdentifier(), M->getContext());
New->setDataLayout(M->getDataLayout());
New->setTargetTriple(M->getTargetTriple());
New->setModuleInlineAsm(M->getModuleInlineAsm());
// Loop over all of the global variables, making corresponding globals in the
// new module. Here we add them to the VMap and to the new Module. We
// don't worry about attributes or initializers, they will come later.
//
for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
I != E; ++I) {
GlobalVariable *GV = new GlobalVariable(*New,
I->getValueType(),
I->isConstant(), I->getLinkage(),
(Constant*) nullptr, I->getName(),
(GlobalVariable*) nullptr,
I->getThreadLocalMode(),
I->getType()->getAddressSpace());
GV->copyAttributesFrom(&*I);
VMap[&*I] = GV;
}
// Loop over the functions in the module, making external functions as before
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
Function *NF =
Function::Create(cast<FunctionType>(I->getValueType()),
I->getLinkage(), I->getName(), New.get());
NF->copyAttributesFrom(&*I);
VMap[&*I] = NF;
}
// Loop over the aliases in the module
for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
I != E; ++I) {
if (!ShouldCloneDefinition(&*I)) {
// An alias cannot act as an external reference, so we need to create
// either a function or a global variable depending on the value type.
// FIXME: Once pointee types are gone we can probably pick one or the
// other.
GlobalValue *GV;
if (I->getValueType()->isFunctionTy())
GV = Function::Create(cast<FunctionType>(I->getValueType()),
GlobalValue::ExternalLinkage, I->getName(),
New.get());
else
GV = new GlobalVariable(
*New, I->getValueType(), false, GlobalValue::ExternalLinkage,
(Constant *)nullptr, I->getName(), (GlobalVariable *)nullptr,
I->getThreadLocalMode(), I->getType()->getAddressSpace());
VMap[&*I] = GV;
// We do not copy attributes (mainly because copying between different
// kinds of globals is forbidden), but this is generally not required for
// correctness.
continue;
}
auto *GA = GlobalAlias::create(I->getValueType(),
I->getType()->getPointerAddressSpace(),
I->getLinkage(), I->getName(), New.get());
GA->copyAttributesFrom(&*I);
VMap[&*I] = GA;
}
// Now that all of the things that global variable initializer can refer to
// have been created, loop through and copy the global variable referrers
// over... We also set the attributes on the global now.
//
for (Module::const_global_iterator I = M->global_begin(), E = M->global_end();
I != E; ++I) {
GlobalVariable *GV = cast<GlobalVariable>(VMap[&*I]);
if (!ShouldCloneDefinition(&*I)) {
// Skip after setting the correct linkage for an external reference.
GV->setLinkage(GlobalValue::ExternalLinkage);
continue;
}
if (I->hasInitializer())
GV->setInitializer(MapValue(I->getInitializer(), VMap));
}
// Similarly, copy over function bodies now...
//
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
Function *F = cast<Function>(VMap[&*I]);
if (!ShouldCloneDefinition(&*I)) {
// Skip after setting the correct linkage for an external reference.
F->setLinkage(GlobalValue::ExternalLinkage);
// Personality function is not valid on a declaration.
F->setPersonalityFn(nullptr);
continue;
}
if (!I->isDeclaration()) {
Function::arg_iterator DestI = F->arg_begin();
for (Function::const_arg_iterator J = I->arg_begin(); J != I->arg_end();
++J) {
DestI->setName(J->getName());
VMap[&*J] = &*DestI++;
//.........这里部分代码省略.........
/// NaClValueEnumerator - Enumerate module-level information.
NaClValueEnumerator::NaClValueEnumerator(const Module *M) {
// Create map for counting frequency of types, and set field
// TypeCountMap accordingly. Note: Pointer field TypeCountMap is
// used to deal with the fact that types are added through various
// method calls in this routine. Rather than pass it as an argument,
// we use a field. The field is a pointer so that the memory
// footprint of count_map can be garbage collected when this
// constructor completes.
TypeCountMapType count_map;
TypeCountMap = &count_map;
IntPtrType = IntegerType::get(M->getContext(), PNaClIntPtrTypeBitSize);
// Enumerate the functions. Note: We do this before global
// variables, so that global variable initializations can refer to
// the functions without a forward reference.
for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) {
EnumerateValue(I);
}
// Enumerate the global variables.
FirstGlobalVarID = Values.size();
for (Module::const_global_iterator I = M->global_begin(),
E = M->global_end(); I != E; ++I)
EnumerateValue(I);
NumGlobalVarIDs = Values.size() - FirstGlobalVarID;
// Enumerate the aliases.
for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
I != E; ++I)
EnumerateValue(I);
// Remember what is the cutoff between globalvalue's and other constants.
unsigned FirstConstant = Values.size();
// Skip global variable initializers since they are handled within
// WriteGlobalVars of file NaClBitcodeWriter.cpp.
// Enumerate the aliasees.
for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end();
I != E; ++I)
EnumerateValue(I->getAliasee());
// Insert constants that are named at module level into the slot
// pool so that the module symbol table can refer to them...
EnumerateValueSymbolTable(M->getValueSymbolTable());
// Enumerate types used by function bodies and argument lists.
for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) {
for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
I != E; ++I)
EnumerateType(I->getType());
for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E;++I){
// Don't generate types for elided pointer casts!
if (IsElidedCast(I))
continue;
if (const SwitchInst *SI = dyn_cast<SwitchInst>(I)) {
// Handle switch instruction specially, so that we don't
// write out unnecessary vector/array types used to model case
// selectors.
EnumerateOperandType(SI->getCondition());
} else {
for (User::const_op_iterator OI = I->op_begin(), E = I->op_end();
OI != E; ++OI) {
EnumerateOperandType(*OI);
}
}
EnumerateType(I->getType());
}
}
// Optimized type indicies to put "common" expected types in with small
// indices.
OptimizeTypes(M);
TypeCountMap = NULL;
// Optimize constant ordering.
OptimizeConstants(FirstConstant, Values.size());
}
// InlineFunction - This function inlines the called function into the basic
// block of the caller. This returns false if it is not possible to inline this
// call. The program is still in a well defined state if this occurs though.
//
// Note that this only does one level of inlining. For example, if the
// instruction 'call B' is inlined, and 'B' calls 'C', then the call to 'C' now
// exists in the instruction stream. Similiarly this will inline a recursive
// function by one level.
//
bool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) {
Instruction *TheCall = CS.getInstruction();
assert(TheCall->getParent() && TheCall->getParent()->getParent() &&
"Instruction not in function!");
const Function *CalledFunc = CS.getCalledFunction();
if (CalledFunc == 0 || // Can't inline external function or indirect
CalledFunc->isDeclaration() || // call, or call to a vararg function!
CalledFunc->getFunctionType()->isVarArg()) return false;
// If the call to the callee is not a tail call, we must clear the 'tail'
// flags on any calls that we inline.
bool MustClearTailCallFlags =
!(isa<CallInst>(TheCall) && cast<CallInst>(TheCall)->isTailCall());
// If the call to the callee cannot throw, set the 'nounwind' flag on any
// calls that we inline.
bool MarkNoUnwind = CS.doesNotThrow();
BasicBlock *OrigBB = TheCall->getParent();
Function *Caller = OrigBB->getParent();
// GC poses two hazards to inlining, which only occur when the callee has GC:
// 1. If the caller has no GC, then the callee's GC must be propagated to the
// caller.
// 2. If the caller has a differing GC, it is invalid to inline.
if (CalledFunc->hasGC()) {
if (!Caller->hasGC())
Caller->setGC(CalledFunc->getGC());
else if (CalledFunc->getGC() != Caller->getGC())
return false;
}
// Get an iterator to the last basic block in the function, which will have
// the new function inlined after it.
//
Function::iterator LastBlock = &Caller->back();
// Make sure to capture all of the return instructions from the cloned
// function.
std::vector<ReturnInst*> Returns;
ClonedCodeInfo InlinedFunctionInfo;
Function::iterator FirstNewBlock;
{ // Scope to destroy ValueMap after cloning.
DenseMap<const Value*, Value*> ValueMap;
assert(CalledFunc->arg_size() == CS.arg_size() &&
"No varargs calls can be inlined!");
// Calculate the vector of arguments to pass into the function cloner, which
// matches up the formal to the actual argument values.
CallSite::arg_iterator AI = CS.arg_begin();
unsigned ArgNo = 0;
for (Function::const_arg_iterator I = CalledFunc->arg_begin(),
E = CalledFunc->arg_end(); I != E; ++I, ++AI, ++ArgNo) {
Value *ActualArg = *AI;
// When byval arguments actually inlined, we need to make the copy implied
// by them explicit. However, we don't do this if the callee is readonly
// or readnone, because the copy would be unneeded: the callee doesn't
// modify the struct.
if (CalledFunc->paramHasAttr(ArgNo+1, Attribute::ByVal) &&
!CalledFunc->onlyReadsMemory()) {
const Type *AggTy = cast<PointerType>(I->getType())->getElementType();
const Type *VoidPtrTy = PointerType::getUnqual(Type::Int8Ty);
// Create the alloca. If we have TargetData, use nice alignment.
unsigned Align = 1;
if (TD) Align = TD->getPrefTypeAlignment(AggTy);
Value *NewAlloca = new AllocaInst(AggTy, 0, Align, I->getName(),
Caller->begin()->begin());
// Emit a memcpy.
const Type *Tys[] = { Type::Int64Ty };
Function *MemCpyFn = Intrinsic::getDeclaration(Caller->getParent(),
Intrinsic::memcpy,
Tys, 1);
Value *DestCast = new BitCastInst(NewAlloca, VoidPtrTy, "tmp", TheCall);
Value *SrcCast = new BitCastInst(*AI, VoidPtrTy, "tmp", TheCall);
Value *Size;
if (TD == 0)
Size = ConstantExpr::getSizeOf(AggTy);
else
Size = ConstantInt::get(Type::Int64Ty, TD->getTypeStoreSize(AggTy));
// Always generate a memcpy of alignment 1 here because we don't know
// the alignment of the src pointer. Other optimizations can infer
// better alignment.
Value *CallArgs[] = {
//.........这里部分代码省略.........
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